Electrofluorochromism at the single molecule level
arXiv:1802.00764 · doi:10.1126/science.aat1603
Abstract
The interplay between the oxidation state and the optical properties of molecules plays a key role for applications in displays, sensors or molecular-based memories. The fundamental mechanisms occurring at the level of a single-molecule have been difficult to probe. We used a scanning tunneling microscope (STM) to characterize and control the fluorescence of a single Zn-phthalocyanine radical cation adsorbed on a NaCl-covered Au(111) sample. The neutral and oxidized states of the molecule were identified on the basis of their fluorescence spectra that revealed very different emission energies and vibronic fingerprints. The emission of the charged molecule was controlled by tuning the thickness of the insulator and the plasmons localized at the apex of the STM tip. In addition, sub-nanometric variations of the tip position were used to investigate the charging and electroluminescence mechanisms.
11 pages, 4 figures
References in corpus (4)
- Orbital-selective single molecule excitation and spectroscopy based on plasmon-exciton coupling
- Electrically-driven vibronic spectroscopy with sub-molecular resolution
- Narrow-line single-molecule transducer between electronic circuits and surface plasmons
- Gating the charge state of a single molecule by local electric fields
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